technology Honda-> 2 rings = less friction = more power
Piston - 150-4S TOKAWA 60 mm 13mm pin 
Reduction of friction by segmentation optimization
Book with rings, pin of 13 mm and clips.
Replacement recommended every 20 h in intensive use.
Engine oil advises semi synthetic 10W40 (pure synthese will cause oil consumption)
Assembling the piston: the arrow in the direction of the exhaust
Honda technology -> 2 rings = reduced friction = more power